Measure CDN traffic utilization against contracted or engineered capacity, including remaining headroom, peak-adjusted usage, and the capacity needed at a target utilization.
Average utilization shows how much of the stated monthly capacity is consumed. Peak-adjusted utilization is a stress indicator based on the entered peak factor, not a measured bandwidth percentile.
Traffic allowance and instantaneous throughput are different constraints. Use consistent capacity units and evaluate bandwidth separately when your CDN contract caps requests per second or throughput.
At 600 TB of average traffic and 1,000 TB of capacity, utilization is 60.00% and headroom is 400 TB. A 1.35× peak factor produces 81.00% peak-adjusted utilization. At a 75% target, required capacity is 800 TB.
Enter the usable traffic allowance for the same period and unit as the observed traffic.
The estimated peak demand can exceed stated capacity when average traffic multiplied by the peak factor is larger than capacity.
No. Utilization compares traffic with capacity, while cache hit ratio measures requests or bytes served from cache.
A lower target requires more capacity for the same average traffic and therefore creates more headroom.
Yes, if both usage and capacity use the same throughput unit and observation basis; the displayed TB labels would then be conceptual only.
| Variable | Meaning | Unit |
|---|---|---|
| U | Average utilization | % |
| T | Observed traffic | TB/month |
| C | Usable capacity | TB/month |
| P | Peak-to-average factor | multiple |